全文获取类型
收费全文 | 1365篇 |
免费 | 79篇 |
国内免费 | 8篇 |
专业分类
耳鼻咽喉 | 14篇 |
儿科学 | 120篇 |
妇产科学 | 33篇 |
基础医学 | 93篇 |
口腔科学 | 14篇 |
临床医学 | 92篇 |
内科学 | 264篇 |
皮肤病学 | 35篇 |
神经病学 | 106篇 |
特种医学 | 67篇 |
外科学 | 303篇 |
综合类 | 26篇 |
预防医学 | 50篇 |
眼科学 | 45篇 |
药学 | 117篇 |
中国医学 | 2篇 |
肿瘤学 | 71篇 |
出版年
2023年 | 10篇 |
2022年 | 17篇 |
2021年 | 38篇 |
2020年 | 22篇 |
2019年 | 33篇 |
2018年 | 50篇 |
2017年 | 33篇 |
2016年 | 39篇 |
2015年 | 38篇 |
2014年 | 65篇 |
2013年 | 76篇 |
2012年 | 111篇 |
2011年 | 114篇 |
2010年 | 61篇 |
2009年 | 58篇 |
2008年 | 81篇 |
2007年 | 81篇 |
2006年 | 61篇 |
2005年 | 56篇 |
2004年 | 41篇 |
2003年 | 26篇 |
2002年 | 30篇 |
2001年 | 26篇 |
2000年 | 39篇 |
1999年 | 16篇 |
1998年 | 19篇 |
1997年 | 10篇 |
1996年 | 8篇 |
1995年 | 11篇 |
1994年 | 15篇 |
1993年 | 11篇 |
1992年 | 16篇 |
1991年 | 11篇 |
1990年 | 8篇 |
1989年 | 12篇 |
1988年 | 17篇 |
1987年 | 11篇 |
1986年 | 8篇 |
1985年 | 9篇 |
1984年 | 9篇 |
1983年 | 7篇 |
1982年 | 6篇 |
1980年 | 3篇 |
1977年 | 3篇 |
1976年 | 3篇 |
1975年 | 3篇 |
1971年 | 2篇 |
1968年 | 2篇 |
1967年 | 3篇 |
1924年 | 2篇 |
排序方式: 共有1452条查询结果,搜索用时 15 毫秒
101.
Surgical management of giant descending aortic thrombus detected by transesophageal echocardiography
Biren P. Modi M.S. Michael J. Longo M.D. Gary S. Kopf M.D. John A. Elefteriades M.D. 《The International journal of angiology》2000,9(4):243-245
With the advent of transesophageal echocardiography (TEE), giant thrombi of the descending aorta are becoming increasingly recognized as possible sources of peripheral emboli. This report describes the management of three patients presenting with multiple unexplained peripheral emboli. All three patients were treated successfully with aortic thrombectomy and long-term anticoagulation. 相似文献
102.
Hartnoll G Bétrémieux P Modi N 《Archives of disease in childhood. Fetal and neonatal edition》2000,83(1):F56-F59
BACKGROUND: Preterm birth is often associated with impaired growth. Small for gestational age status confers additional risk. AIM: To determine the body water content of appropriately grown (AGA) and small for gestational age (SGA) preterm infants in order to provide a baseline for longitudinal studies of growth after preterm birth. METHODS: All infants born at the Hammersmith and Queen Charlotte's Hospitals between 25 and 30 weeks gestational age were eligible for entry into the study. Informed parental consent was obtained as soon after delivery as possible, after which the extracellular fluid content was determined by bromide dilution and total body water by H(2)(18)O dilution. RESULTS: Forty two preterm infants were studied. SGA infants had a significantly higher body water content than AGA infants (906 (833-954) and 844 (637-958) ml/kg respectively; median (range); p = 0.019). There were no differences in extracellular and intracellular fluid volumes, nor in the ratio of extracellular to intracellular fluid. Estimates of relative adiposity suggest a body fat content of about 7% in AGA infants, assuming negligible fat content in SGA infants and lean body tissue hydration to be equivalent in the two groups. CONCLUSIONS: Novel values for the body water composition of the SGA preterm infant at 25-30 weeks gestation are presented. The data do not support the view that SGA infants have extracellular dehydration, nor is their regulation of body water impaired. 相似文献
103.
BACKGROUND: Extremely preterm birth, even in the absence of significant neurological impairment, is associated with altered pain responses and impaired memory and behaviour. Preterm birth increases the risk of maternal depression and may impede the development of the mother-infant relationship, factors that in turn are also associated with impaired infant outcome. Mother-infant skin-to-skin contact has been recommended as a simple means of ameliorating these effects. METHODS: We conducted a pragmatic, prospective, controlled, intention-to-treat trial in two neonatal intensive care units. Infants born below 32 weeks gestation were recruited within the first week after birth and assigned to a control group receiving standard care, or an intervention group in which mothers were encouraged to provide a session of skin-to-skin contact once daily for 4 weeks. We assessed infant behaviour at time of discharge from hospital, responses to immunisation at 4 and 12 months of age, and memory, behaviour and development at 1 year corrected (postmenstrual) age. Indices of maternal depression, stress, anxiety, lactation performance and infant interaction were assessed at time of infant discharge, 4 months and 1 year. RESULTS: No significant difference was identified in any infant or maternal measure at any time point. CONCLUSIONS: Mother-infant skin-to-skin contact after extremely preterm birth results in neither benefit nor adverse consequences. Although there is no reason to dissuade mothers who wish to provide STS contact, we are unable to recommend resource allocation for the implementation of STS programmes for extremely preterm infants in a neonatal intensive care unit setting. 相似文献
104.
At birth, premature infants of 25-29 weeks gestation, at high risk for development of neonatal respiratory distress syndrome (RDS), were given a single dose (90 mg) of calf lung surfactant extract (CLSE) by intratracheal instillation. The frequency and severity of RDS were assessed with use of a simple radiographic scoring system in which pulmonary parenchymal densities and the prominence of the air-bronchogram effect were used as indicators of widespread atelectasis. Radiographs were obtained in surfactant-treated and control infants within the first 90 minutes of life as part of an initial evaluation of their pulmonary status. Subsequent examinations were performed at less than 24 hours and less than 48 hours of age. Radiographic assessment of lung disease compared consistently with coordinated data on oxygen and mean airway pressure requirements of the infants. Both indicated a significantly decreased frequency and severity of RDS in the infants treated with surfactant. The results provide supporting evidence of the effectiveness of exogenous lung surfactant replacement in mitigating RDS in very premature infants. 相似文献
105.
The urinary excretion rate of creatinine was measured over 89 days in 31 infants of gestational ages 25-34 weeks in the first week of life. Creatinine excretion was shown to have a significant positive correlation with weight and postconceptional age. Creatinine excretion factored by body weight was also positively correlated with weight and postconceptional age. Pooled analysis of published data together with our own, confirms that this correlation is important. Muscle mass was estimated from creatinine excretion rate. A regression equation was derived predicting muscle mass from birth-weight and gestational age. Muscle mass increases from 12% of birthweight at 25 weeks gestation to 19% at 34 weeks and 24% at 40 weeks. This is in agreement with classic dissection studies which showed muscle mass to be 25% of body weight at term. 相似文献
106.
A unit of whole donor blood, the plasma of which contained anti-Kell antibody, was transfused into a Kell-negative patient who had received a unit of Kell-positive blood 4 weeks previously. A haemolytic transfusion reaction ensued. The antibody had gone undetected in routine automated screening of the donor blood. Automated antibody detection techniques do not offer reliable detection of anti-Kell antibodies. 相似文献
107.
108.
109.
110.
Michael M. Kheir Timothy L. Tan Colin T. Ackerman Ronuk Modi Carol Foltz Javad Parvizi 《The Journal of arthroplasty》2018,33(11):3531-3536.e1